Question about 2002 Cadillac Deville

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No problem the service engine light is on and I am told it reads torque converter

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Sounds like P0741 code. Run a self diagnostic. If this is your code, it will likely trigger the check engine light when you're driving at around 80 km/h (overdrive fails). If you're still running, your torque converter clutch is probably stuck on. The fix require the tranny to be opened up and a solenoid changed (14 - 20hrs labour). If you can live with the light coming on and slightly worse fuel economy, then let it be. Make sure you check the codes yourself to be sure. And get it serviced if you notice any change in the way she drives.

Posted on Feb 01, 2011


Ralph Cronenberg

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Thats what transfers power from the engine to the transmission have it checked before you get stranded some place

Posted on Sep 18, 2010


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P0740 JEEP - Torque Converter Clutch Circuit
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
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When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

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The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

I’m happy to help further over the phone at

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